[libc] Implement vector 'split' and 'concat' routines (#157537) Summary: This provides some helpers for the split and concatenation routines for changing the size of an existing vector. This includes a simple tuple type to do the splitting. The tuple doesn't support structured bindings yet. The concat function is more limited than what would be ideal, but the shufflevector builtin requires things of equivalent sizes and I didn't think it was worth wrangling with that just yet.
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